http://bugzilla.suse.com/show_bug.cgi?id=929471
http://bugzilla.suse.com/show_bug.cgi?id=929471#c27
--- Comment #27 from Dr. Werner Fink ---
Rational for choosing a hostname without domain name can be found in RFC 1178
and RFC 1123
https://tools.ietf.org/html/rfc1178
[...]
Avoid domain names.
For technical reasons, domain names should be avoided. In
particular, name resolution of non-absolute hostnames is
problematic. Resolvers will check names against domains before
checking them against hostnames. But we have seen instances of
mailers that refuse to treat single token names as domains.
For example, assume that you mail to "libes@rutgers" from
yale.edu. Depending upon the implementation, the mail may go
to rutgers.edu or rutgers.yale.edu (assuming both exist).
[...]
https://tools.ietf.org/html/rfc1123
2.1 Host Names and Numbers
The syntax of a legal Internet host name was specified in RFC-952
[DNS:4]. One aspect of host name syntax is hereby changed: the
restriction on the first character is relaxed to allow either a
letter or a digit. Host software MUST support this more liberal
syntax.
Host software MUST handle host names of up to 63 characters and
SHOULD handle host names of up to 255 characters.
[...]
Btw: the array for the hostname in /proc/sys/kernel/hostname has 64 characters
which includes the trailing ASCII null as well as the hostname.
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